monroe



(NOM0del.)

E. P. MONROE.

SLIDE VALVE. V

No. 293,975. Patented Feb. 19, 1884.

INVENTOR EM ea um, AT

UNITED STATES PATENT -OFFI E..-

EDWIN PEAR MONROE, OF NEIV YORK, N. Y.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 293,975, dated February 19, 1884.

Application filed January 17, 1883.

To all whom it may concern.-

Be it known that I, EDWIN PnAR MoNRoE, of the city, county, and State of New York, have invented a new and useful Improvement in Slide-Valves, of which the following is a specification.

The invention relates to the slide-valve of a steam-engine cylinder; and it consists in constructing the valve with a cast-iron body and with a face-plate of gun metal or analogous alloy, the said face-plate being provided with pockets filled with Babbitt or other anti-friction metal.',

In the accompanying drawings, Figure 1 is a longitudinal section of the valve 011 the line a: 00 of Fig. 2. Fig. 2 is a plan view of the under side of the face-plate. Fig. 3 is a transverse section on the line y 3 of Fig.2, showing the manner of uniting the valve-body and faceplate.

Similar letters of reference indicate like parts.

A is the body of the valve, made of cast-iron in the usual form.

B is the face-plate, of gun metal or analogous composition.

In the under or working side of the. faceplate are formed pockets 0; Said pockets are preferably placed angularly across the faceplate, as shown in Fig. 2, and are made of dovetail shape in cross-section, as represented in Fig. 1that is to say, the bottoms D of said pockets are larger inarea than the orifices E.

In the upper side of the face-plate B, I form a mortise, also of dovetail shape in cross-section. This mortise receives a correspond ingly-shaped tenon, F, formed on the valve body A.

In practice, I cast the face-plate B separately with the mortise and pockets, as described. Then, while the casting is still hot, I insert the tenon F into the mortise in the face-plate. As the face-plate cools it contracts firmly upon the tenon, so that the faceplate thus becomes firmly united to the body of the valve. \Vhen the valve thus constructed is subjected to the heat of the steam in the valve-chest, the iron body A expands more than the composition face-plate B, the ratio of expansion of castiron being greater than that of the alloy, and

(No model.)

hence the tenon fits all the more tightly in its mortise. I tin the interior of the pockets 0 by any known way, and then fillsaid pockets with Babbitt or anti-friction metal in a molten state. WVhen the Babbitt has cooled and hardened, I bring the valve-face to a smooth and uniform surface..- The object of tinning the interior of the pockets is to cause the antifriction metal firmly to adhere to the sides. The dovetail form of the pockets prevents the resulting plugs of Babbitt from falling out under any circumstances. I prefer a number of small pockets in the valve-face to a few large pockets, because the aforesaid arrangement leaves numerous partitions II, which serve to strengthen the faceplate. The object of placing the pockets diagonally instead of straight across the valveface is to cause the two edges, which in the last-mentioned case wouldstand at right angles-to the line of longitudinal motion of the valve, to be presented at an acute angle thereto. This decreases the likelihood of abrasion of said edges.

I have found by experiment that the abovedescribed construction of a slide-valve offers great advantages in the prevention of friction of the valve on its seat and in the consequent diminution of wear of the valve. This is an important desideratum, especially in locomotive-engines, where worn and leaky slide-valves.

are constant sources of expense and of waste of steam.

I claim as my invention 1. In a slide-valve, the combination of a cast-iron body, a face-plate of gun metal or analogous alloy, and plugs or blocks of antifriction metal inserted and held in mortises or pockets in the faceplate, substantially as described.

2. A slide-valve having an iron body provided with a dovetail tenon, and a gun-metal or composition face-plate provided with a corresponding mortise, the body and face-plate being united by said tenon and mortise, substantially as described.

3. In a slide-valve, a'face-plate of gun metal or analogous alloy, containing pockets of dovetail cross-section, filled with Babbitt or other anti-friction metal, substantially as described.

4. In a slide-valve, and in the faceplate TOO thereof, pockets containing Babbitt or other anti-friction metal each pocket having two of its parallel outer edges placed at an acute angle to the longitudinal axis of the valve-face, substantially as described. 7

5. The method herein set forth of attaching Babbitt-metal plugs to and in the gunqnetal face-plate of a slide-valve, consisting in forming said face-plate with pockets of dovetail cross-section larger at the base than at the 10 orifice, tinning the interior of said pockets and filling the same with melted Babbitt metal, substantially as described.

EDVIN P. MONROE.

Vitnesses:

PARK BENJAMIN, H. F. BURNS. 

